Engine surge
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New User
Joined: May 2005
Posts: 9
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From: Inuvik, NT, Canada
Engine surge
I have a 1992 F-150 XLT Auto, that I purchased recently. When I am driving at low speeds [betweem 5 and 20 mph] I get these rhythmic engine surges, while applying a constant pressure on the gas peddle.
I also have an unrelated problem with the rear tank, coughing and sputtering, as though there's water in the gas or something. When I start the engine cold on the rear tank, it runs fine until the engine warms up, and the idle kicks itself back down, whereupon it runs rough, as though starved for gas, and sometimes actually stalls. This does not happen with the foreward tank. I've tried methyl hydrate, and running the tank near empty and refilling it twice, to no avail. If anyone has an answer for each of these problems I'd appreciate your insight.
I also have an unrelated problem with the rear tank, coughing and sputtering, as though there's water in the gas or something. When I start the engine cold on the rear tank, it runs fine until the engine warms up, and the idle kicks itself back down, whereupon it runs rough, as though starved for gas, and sometimes actually stalls. This does not happen with the foreward tank. I've tried methyl hydrate, and running the tank near empty and refilling it twice, to no avail. If anyone has an answer for each of these problems I'd appreciate your insight.
Elder User
Joined: Oct 2004
Posts: 984
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From: Winnipeg, Manitoba
Get a fuel pressure test done at a local shop you can depend on. These trucks often have the in-tank fuel pump give way. Definitely sounds like your rear tank problem, and from my own experience, the two tank trucks seem to have both pumps give way at the same time, or relatively close to each other.
Posting Guru
Joined: Dec 2004
Posts: 1,159
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From: Connecticut
It could be something like my 89 had. I found pin holes in the rear tank feed line where it turns out of the tank on the sending unit and conects to the rubber hose.Not enough of a leak to leak fuel but just enough to let air into the line.Gotta love New England they put enough salt on the roads the rot anything. I replaced the sending unit and it ran like a champ.If it's a 92 could be IAC switch is gummed up or even injectors or crab in just dirty
